Malicious PDF — malware analysis report

Static analysis result for SHA-256 83937b95a2a3ddd6…

MALICIOUS

PDF

76.6 KB Created: 2021-05-12 19:55:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: c850a818627771f1eb8d94f53c7afcaf SHA-1: df07db658a84e894ba7cd0bffc5eefe7d370f5cf SHA-256: 83937b95a2a3ddd63087fece4d6738fbb14aded914c8fdf7a3958432035eee37
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by multiple heuristics as malicious, including a specific ClamAV detection for Pdf.Phishing.Trojan. The presence of numerous external URIs, many pointing to disposable hosting and employing UTM parameters, strongly suggests a phishing or link-farming campaign. The ML classifier also returned a high confidence score for maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://xajibur.ru/strik?utm_term=how+to+write+a+paper+example PDF link annotation
    • https://dukiferuxol.weebly.com/uploads/1/3/0/8/130873869/9448291.pdfIn PDF document text
    • https://dotomogef.weebly.com/uploads/1/3/4/7/134760479/gigibuxad.pdfIn PDF document text
    • http://present-mag.ru/persona_4_exam_answers_07_19y6j8a.pdfIn PDF document text
    • https://namekabesomi.weebly.com/uploads/1/3/4/6/134668803/3312b08a74.pdfIn PDF document text
    • http://shopee24.site/another_country_james_baldwin0lkz8.pdfIn PDF document text
    • http://carishr.com/66105231326fqet8.pdfIn PDF document text
    • https://tikedamo.weebly.com/uploads/1/3/1/4/131453682/panubirololizuj.pdfIn PDF document text
    • https://womarunere.weebly.com/uploads/1/3/4/3/134315700/4519775.pdfIn PDF document text
    • http://monongzhlh.space/dosajivugofijetozatilat2r8nh.pdfIn PDF document text
    • https://lirowutezi.weebly.com/uploads/1/3/4/6/134696369/jafolikumunasodesew.pdfIn PDF document text
    • https://roxobirunuj.weebly.com/uploads/1/3/4/0/134096027/7032108.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/cae58d9b-006c-400f-87b9-f3512cd7859b/what_are_the_10_naeyc_standards.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ac99fff-e4a0-4e72-b3ef-aace87b6a71b/pogibuwulodugowin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f1c495f-d0a2-4733-b5b2-fe5900984117/an_egg_has_23_chromosomes_is_it_haploid_or_diploid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/24cf8335-6e6e-48fb-8462-0d795cc03b4e/the_scarlet_pimpernel_movie_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2007b4f6-9eb2-45a3-bf02-889c7640fc92/forged_by_fire_harrisonville.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7977a7c7-8610-41b8-a9b6-2e81b4fd6f89/fundamentals_of_geotechnical_engineering_5th_edition_solution_manual_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f8b7ce0f-7459-45eb-9723-12d4e40408e7/is_an_instant_pot_same_as_a_pressure_cooker.pdfIn PDF document text
    • https://s3.amazonaws.com/setikizo/piramalamumarawefubor.pdfIn PDF document text
    • https://s3.amazonaws.com/lupebesu/silazowonarokaxenusaxuboj.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF3E 4908 bytes
SHA-256: 4548ba4f31837e52b3f700c10ce62c7939d14efc2243376705b59e9a0a13f2c7
font_01_sfnt_off0000ffe9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFE9 10432 bytes
SHA-256: 9dc5e68b65b94205daf23ab58753addbdbaf7a3df9614f604d2427e7b3265173

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